ISO 6808:2014

Overview

ISO 6808:2014 - "Plastics hoses and hose assemblies for suction and low‑pressure discharge of petroleum liquids - Specification" - defines minimum requirements for polymer‑reinforced thermoplastics hoses and hose assemblies used to convey kerosene, heating oil, diesel fuel and lubricating oils. The standard covers two hose types for suction and low‑pressure discharge in the temperature range ‑10 °C to +45 °C (storage tolerant from ‑30 °C to +65 °C). It is not intended for automotive/aviation fuel or metered delivery.

Key Topics and Technical Requirements

• Hose types & pressure ratings
  • Type 1 (light service): maximum working pressure 0.3 MPa (3 bar) at 23 °C; 0.07 MPa (0.7 bar) at 45 °C. Burst ratio 4:1.
  • Type 2 (normal service): up to hose size 25 - 0.55 MPa (5.5 bar) at 23 °C; above size 25 up to 50 - 0.4 MPa (4 bar). All sizes at 45 °C - 0.15 MPa (1.5 bar). Burst ratio 5:1 (rounded).
• Construction & materials
  • Polymer‑reinforced thermoplastic lining and cover with a supporting helix.
  • Wall components must be fused and free of defects.
  • Electrical bonding: at least two flexible metallic bonding wires incorporated between cover and lining and bonded to couplings; hose assemblies must be electrically bonded between couplings.
• Dimensions & tolerances
  • Internal diameters and tolerances follow listed hose sizes (per ISO 1307). Tolerances on cut lengths specified.
• Performance & tests
  • Hydrostatic testing at ambient and 45 °C (per ISO 1402) to verify working and burst pressures.
  • Additional tests: suction resistance, reinforcement fracture, minimum and cold bend tests, electrical continuity, fuel/oil resistance, tensile/elongation, loss on heating and accelerated ageing.
• Marking, type tests and production test frequency are specified to support traceability and quality control.

Applications and Who Uses ISO 6808:2014

• Typical users: hose manufacturers, assembly fabricators, test laboratories, procurement/specification engineers, fuel‑handling equipment suppliers, heating oil distributors, station installers, and compliance officers.
• Practical applications: suction and low‑pressure discharge lines for fuel transfer, oil delivery, mobile tanks, pump connections and maintenance operations where conveyance of kerosene, diesel, heating oil or lubricants is required.

Related Standards

ISO 6808 references several normative documents used for testing and terminology, including:

• ISO 1402 (hydrostatic testing), ISO 8031 (electrical resistance), ISO 7233 (vacuum/suction), ISO 1817 / IRM 903 (fluid resistance), ISO 10619 (bending tests), ISO 1307 (hose sizes), ISO 8330 (vocabulary).

ISO 6808:2014 is essential for specifying compliant plastics hoses and hose assemblies for petroleum liquids, ensuring safe mechanical and electrical performance in suction and low‑pressure discharge applications. Keywords: ISO 6808:2014, plastics hoses, hose assemblies, suction and low‑pressure discharge, petroleum liquids, hydrostatic testing, electrical bonding.